Add .autoupdate manifest; restore pkgver corrupted by a failed CI run

The nightly job wrote pkgver="" after its version query 404'd, taking the
sha256 of a zero-byte download with it. Restores 1.3.0 as the baseline; the
autoupdater takes it to 1.4.0 from there.

.autoupdate

@@ -0,0 +1,6 @@
+# Autoupdater manifest - consumed by aur/.autoupdate
+srchost="gitea"
+srcmntr="source"
+srcname="pman"
+verstrip=""
+gui="false"

PKGBUILD

@@ -2,7 +2,7 @@
 
 _pkgname="pman"
 pkgname="${_pkgname}-helper"
-pkgver=""
+pkgver="1.3.0"
 pkgrel="3"
 pkgdesc="A pacman helper script, because you forget all the stupid flags"
 url="https://git.bjphoster.com/source/${_pkgname}"